When To Bring 'It' Up: Defining the Relationship

Yes. I think you are being naive. There is such a thing as 'friends with benefits'. Some men are quite happy with that. The woman won't probably discover this until time has passed.

However, if you somehow feel the need to be explicit about it... close your eH account down, print off the confirmation screen, and leave it on the kitchen table with a rose when you invite her over to make cookies.

Folks,
I often laugh at some of the eH advice columns and I’ll give a nod to WeDesignOurLives.
After three months of dating someone... we’d likely have 8-10 dates and maybe a hundred hours of phone and email time. We know each other’s work schedules, what activities we do, how often we weren’t available for dates, etc. From their availability, the obvious commitment they are putting into dating you, and/or how well it is going, I think one should have some idea if the other person wasn’t already exclusive or at least not seriously pursuing others.
However, as a practical matter of having “the talk”... I don’t think it is even necessary. It would appear there are obvious ways to both demonstrate your willingness for exclusivity and to ‘ask’ your partner if this is the case. For example, have her over for dinner and extend the offer to include her parents; ask if she would like to take a three month long cooking class together; ask if you can stop by her office with some flowers and take her to lunch; tell her that some of your friends have tickets to a concert and ask if she would like to come; ask if you can join her and her friends in their annual charity run; etc. Meeting friends, family, coworkers, etc. or committing to longer term activities should be enough to demonstrate exclusivity on both sides. Someone would have to be pretty low to sit down to dinner with their parents knowing they are dating others.
However, if you somehow feel the need to be explicit about it... close your eH account down, print off the confirmation screen, and leave it on the kitchen table with a rose when you invite her over to make cookies.

I had the talk not long ago and brought the subject up. Face it, everyone has a feeling on what the answers will be when the topic is broached and they are hoping the other party confirms it, but by avoiding the issue may result in confusing everyone.

I would never mention it. If he has not broached the subect, it's because he's either not feeeling it, or not ready for something serious. He'll probably feel pressured and thing s will fall apart. If he does not seem inclined to 'get serious'. I would quietly start seeing other men. Simple.